Shows you a relevant Wikipedia article along with your search results. Clicking links in the article will trigger new Google searches, making it a very useful research tool...
Add useful extra features to Google Reader, like feed favicons, inline article previews, and unread counts in your browser tab with Better GReader.
Note from Mozilla: This add-on has been discontinued. Try Evernote instead.
Clipmarks lets you clip and share specific parts of articles, or anything else you read.
UberNote is a knowledge management tool enabling you to quickly store your content online from anywhere. Easily access your notes, clip web content, bookmark, and add notes with the browser toolbar. It's free, easy to use, and organizes your notes ...
Chromifox Companion configures Chromifox Extreme themes with Chrome like features.